One vertex per element, one color per generator, with an edge from x to x·s.
(5,6)(7,8)(10,11)(14,15)(17,18,21,24,20,22,28,31)(19,25,27,30,26,32,29,23)(1,2)(3,4)(9,10)(11,13)(12,14)(15,16)(18,22)(23,30)(24,31)(25,32) involution — undirected(2,4)(9,11,13,10)(12,14,16,15)(17,19,20,26)(18,23,22,30)(21,29,28,27)(24,32,31,25)(6,8)(9,12,13,16)(10,14,11,15)(19,26)(23,30)(25,32)(27,29)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.